[OpenSER-Users] NAT question

[Papadopoulos Georgios]

Hello all,
 
I need some advice from all you NAT experts. Assume that we have two
OpenSER proxies serving two different domains and they both use
nathelper. Also assume that their configuration is identical and looks
roughly like:
 
route {
...
        record_route();
 
        if (nat_uac_test("23")) {
                if (method!="REGISTER" &&
!is_present_hf("Record-Route")) {
                    fix_nated_contact();
                }
        }
 
        t_on_reply("1");
}
 
onreply_route[1] {
        if (nat_uac_test("23")) {
                fix_nated_contact();
        };
}

clientA and clientB are both behind NAT. clientA at domainA sends an INVITE
to clientB at domainB through proxyA:
 
clientA at domainA  -----> ProxyA -----> ProxyB ------> clientB at domainB
 
ProxyA detects that clientA is behind NAT and fixes the contact. ProxyB
finds the Record-Route header, so it does not fix the contact. My
question is about how to handle the 200 OK. With this configuration both
proxies detect that clientB is behind NAT and the contact gets fixed
twice. Is there a way to avoid this?
 
thank you
 
George
 
 
 
 

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